PREDICTION OF FREE FATTY ACID IN CRUDE PALM OIL USING NEAR INFRARED SPECTROSCOPY SITI NURHIDAYAH NAQIAH BINTI ABDULL RANI

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1 i PREDICTION OF FREE FATTY ACID IN CRUDE PALM OIL USING NEAR INFRARED SPECTROSCOPY SITI NURHIDAYAH NAQIAH BINTI ABDULL RANI A thesis submitted in fulfilment of the requirements for the award of the Degree of Master of Engineering (Electrical) Faculty of Electrical Engineering Universiti Teknologi Malaysia MAY 2015

2 Dedicated to all readers. Especially you. iii

3 iv ACKNOWLEDGEMENT Alhamdulillahi rabbi al-a lamin, praise be to Allah SWT for all blessing towards the completion of this thesis. I thanked Assc. Prof. Ir. Dr. Herlina binti Abdul Rahim, my supportive supervisor and the team for all their effort, care and knowledge shared throughout this amazing journey. Officers, staff and friends from Kilang Sawit Jerangau, Felda Sungkai, Felda Johor Bulkers Terminal 1 and Terminal 4, thank you so much for your cooperation, information, advices, suggestions, help and all. I owe you valuable time. I also would like to thank Maisarah Burhanudin, my best friend forever, Siti Nor Zawani Ahmmad, the most helpful friend, Noraini Jalil and Murni Nazira Sarian, my inspiration in completing this thesis and colleague at P08-208, especially, Mr. Muhammad Tahir for assistances and advices. For all my friends who were there in the beginning, in the middle and at the end of this journey, thanks a lot. I pray that you success in life and afterlife; that Allah grant you Jannah. Insha Allah. Last but not least, biggest appreciation goes to my family members, not to exclude, Acik Bubur, Along, Ayah Su & Cik Su for their priceless special care and support in everything I do in my life. I am the luckiest person in world for having all of you as families. Alhamdulillah.

4 v ABSTRACT Free Fatty Acid (FFA) value is widely used as an indicator for crude palm oil (CPO) quality. However, current methods used to measure FFA value are quite time consuming and complex. The application of near infrared (NIR) spectroscopy has drawn the interest to replace the conventional methods to measure FFA value as NIR has been shown to be effective in other food and agriculture industries. At the same time, improved predictive models have facilitated FFA estimation process in recent years. In this research, 176 CPO samples acquired from Felda Johor Bulker Sdn Bhd were investigated. A FOSS NIRSystem was used to take absorbance measurements from these samples. The wavelength range for the spectral measurement is taken at 1600nm to 1900nm. FFA content of each sample was determined by chemical titration method and three prediction models were developed relating FFA value to spectral measurement. The first prediction model based on Partial Least Square Regression (PLSR) yielded a regression coefficient (R) of and for the calibration and validation set respectively. The second prediction model built from Principal Component Regression yielded an R of and for the calibration and validation set respectively. The third prediction model built from Artificial Neural Network (ANN) yielded R of and for the calibration and validation set respectively. Results show that the NIR spectroscopy in a spectral region of 1600nm to 1900nm is suitable and adequate for FFA measurement of CPO and that the accuracy of prediction is high. Results shows that the prediction model using ANN gives the best prediction model of all three models tested.

5 vi ABSTRAK Nilai Asid Lemak Bebas (FFA) telah digunakan secara menyeluruh sebagai kayu ukur kualiti minyak sawit mentah (CPO). Walau bagaimanapun, kaedahkaedah sedia ada untuk mengukur nilai FFA mengambil masa yang agak lama dan rumit. Penggunaan spektroskopi infra-merah (NIR) telah menarik minat kajian ini bagi menggantikan kaedah sedia ada untuk mengukur FFA kerana keberkesanan kaedah tersebut dalam bidang makanan dan agrikultur. Pada masa yang sama, perkembangan model ramalan telah banyak membantu dalam proses anggaran FFA pada tahun-tahun kebelakangan ini. Dalam kajian ini, sebanyak 176 sampel CPO diperoleh daripada Felda Johor Bulkers Sdn Bhd untuk tujuan penyelidikan. FOSS NIRSystem telah digunakan untuk mengambil bacaaan serapan gelombang daripada sampel. Julat panjang gelombang bagi bacaan tersebut diambil daripada 1600nm sehingga 1900nm. Kandungan FFA yang terdapat dalam setiap sampel ditentukan dengan menggunakan kaedah penitratan kimia dan tiga model ramalan dibentuk bagi meramal kandungan FFA daripada gelombang tersebut. Model ramalan pertama menggunakan Regresi Kuasa Dua Terkecil Separa (PLSR) menghasilkan ralat umum ramalan (R) sebanyak dan bagi kumpulan data untuk latihan dan percubaan masing-masing. Model ramalan kedua pula mengunakan Regresi Komponen Utama (PCR) menghasilkan R sebanyak dan bagi kumpulan data untuk latihan dan percubaan masing-masing. Model ramalan ketiga menggunakan Jaringan Saraf Buatan (ANN) menghasilkan R sebanyak dan bagi kumpulan data untuk latihan dan percubaan masing-masing. Dapatan ini menunjukkan bahawa julat gelombang 1600nm hingga 1900nm adalah sesuai dan memadai bagi mengukur nilai FFA yang terkandung dalam minyak sawit mentah dengan nilai ramalan yang tinggi. Keputusan menunjukkan bahawa model ramalan menggunakan ANN adalah model ramalan terbaik di antara ketiga-tiga model yang dikaji.

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